求翻译：20世纪70年代我国先后在天津、云南建立用磷石膏生产硫酸联产水泥的工业生产线，由于各种原因未能投产。是什么意思？

In the 1970s, China has established in Tianjin, Yunnan industrial production lines for the production of sulfuric acid and cement with phosphogypsum, a variety of reasons, unable to put into operation.

Our 70s of the 20th century were established in Tianjin, and Yunnan phosphor gypsum cement production of sulfuric acid production of industrial production lines, due to various reasons, have failed to put into production.

The 20th century 70's our country in Tianjin, Yunnan establishes successively with the phosphorus gypsum production sulfuric acid payment proportional to production cement industry production line, because each kind of reason has not been able to go into production.

In the 1970 of the 20th century has established in Tianjin, Yunnan in China with production of sulfuric acid integrated with cement from phosphogypsum industrial production line, could not be put into production due to various reasons.

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